/*
Language: C-like foundation grammar for C/C++ grammars
Author: Ivan Sagalaev <maniac@softwaremaniacs.org>
Contributors: Evgeny Stepanischev <imbolk@gmail.com>, Zaven Muradyan <megalivoithos@gmail.com>, Roel Deckers <admin@codingcat.nl>, Sam Wu <samsam2310@gmail.com>, Jordi Petit <jordi.petit@gmail.com>, Pieter Vantorre <pietervantorre@gmail.com>, Google Inc. (David Benjamin) <davidben@google.com>
Category: common, system
*/
/* In the future the intention is to split out the C/C++ grammars distinctly
since they are separate languages.  They will likely share a common foundation
though, and this file sets the groundwork for that - so that we get the breaking
change in v10 and don't have to change the requirements again later.

See: https://github.com/highlightjs/highlight.js/issues/2146
*/
export default function (hljs) {
    function optional(s) {
        return '(?:' + s + ')?';
    }
    var DECLTYPE_AUTO_RE = 'decltype\\(auto\\)';
    var NAMESPACE_RE = '[a-zA-Z_]\\w*::';
    var TEMPLATE_ARGUMENT_RE = '<.*?>';
    var FUNCTION_TYPE_RE = '(' + DECLTYPE_AUTO_RE + '|' + optional(NAMESPACE_RE) + '[a-zA-Z_]\\w*' + optional(TEMPLATE_ARGUMENT_RE) + ')';
    var CPP_PRIMITIVE_TYPES = {
        className: 'keyword',
        begin: '\\b[a-z\\d_]*_t\\b'
    };

    // https://en.cppreference.com/w/cpp/language/escape
    // \\ \x \xFF \u2837 \u00323747 \374
    var CHARACTER_ESCAPES = '\\\\(x[0-9A-Fa-f]{2}|u[0-9A-Fa-f]{4,8}|[0-7]{3}|\\S)';
    var STRINGS = {
        className: 'string',
        variants: [
            {
                begin: '(u8?|U|L)?"',
                end: '"',
                illegal: '\\n',
                contains: [hljs.BACKSLASH_ESCAPE]
            },
            {
                begin: "(u8?|U|L)?'(" + CHARACTER_ESCAPES + '|.)',
                end: "'",
                illegal: '.'
            },
            {
                begin: /(?:u8?|U|L)?R"([^()\\ ]{0,16})\((?:.|\n)*?\)\1"/
            }
        ]
    };
    var NUMBERS = {
        className: 'number',
        variants: [
            {
                begin: "\\b(0b[01']+)"
            },
            {
                begin: "(-?)\\b([\\d']+(\\.[\\d']*)?|\\.[\\d']+)(u|U|l|L|ul|UL|f|F|b|B)"
            },
            {
                begin: "(-?)(\\b0[xX][a-fA-F0-9']+|(\\b[\\d']+(\\.[\\d']*)?|\\.[\\d']+)([eE][-+]?[\\d']+)?)"
            }
        ],
        relevance: 0
    };
    var PREPROCESSOR = {
        className: 'meta',
        begin: /#\s*[a-z]+\b/,
        end: /$/,
        keywords: {
            'meta-keyword': 'if else elif endif define undef warning error line pragma _Pragma ifdef ifndef include'
        },
        contains: [
            {
                begin: /\\\n/,
                relevance: 0
            },
            hljs.inherit(STRINGS, {
                className: 'meta-string'
            }),
            {
                className: 'meta-string',
                begin: /<.*?>/,
                end: /$/,
                illegal: '\\n'
            },
            hljs.C_LINE_COMMENT_MODE,
            hljs.C_BLOCK_COMMENT_MODE
        ]
    };
    var TITLE_MODE = {
        className: 'title',
        begin: optional(NAMESPACE_RE) + hljs.IDENT_RE,
        relevance: 0
    };
    var FUNCTION_TITLE = optional(NAMESPACE_RE) + hljs.IDENT_RE + '\\s*\\(';
    var CPP_KEYWORDS = {
        keyword:
            'int float while private char char8_t char16_t char32_t catch import module export virtual operator sizeof dynamic_cast|10 typedef const_cast|10 const for static_cast|10 union namespace unsigned long volatile static protected bool template mutable if public friend ' +
            'do goto auto void enum else break extern using asm case typeid wchar_t ' +
            'short reinterpret_cast|10 default double register explicit signed typename try this ' +
            'switch continue inline delete alignas alignof constexpr consteval constinit decltype ' +
            'concept co_await co_return co_yield requires ' +
            'noexcept static_assert thread_local restrict final override ' +
            'atomic_bool atomic_char atomic_schar ' +
            'atomic_uchar atomic_short atomic_ushort atomic_int atomic_uint atomic_long atomic_ulong atomic_llong ' +
            'atomic_ullong new throw return ' +
            'and and_eq bitand bitor compl not not_eq or or_eq xor xor_eq',
        built_in:
            'std string wstring cin cout cerr clog stdin stdout stderr stringstream istringstream ostringstream auto_ptr deque list queue stack vector map set bitset multiset multimap unordered_set unordered_map unordered_multiset unordered_multimap array shared_ptr abort terminate abs acos ' +
            'asin atan2 atan calloc ceil cosh cos exit exp fabs floor fmod fprintf fputs free frexp ' +
            'fscanf future isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper ' +
            'isxdigit tolower toupper labs ldexp log10 log malloc realloc memchr memcmp memcpy memset modf pow ' +
            'printf putchar puts scanf sinh sin snprintf sprintf sqrt sscanf strcat strchr strcmp ' +
            'strcpy strcspn strlen strncat strncmp strncpy strpbrk strrchr strspn strstr tanh tan ' +
            'vfprintf vprintf vsprintf endl initializer_list unique_ptr _Bool complex _Complex imaginary _Imaginary',
        literal: 'true false nullptr NULL'
    };
    var EXPRESSION_CONTAINS = [CPP_PRIMITIVE_TYPES, hljs.C_LINE_COMMENT_MODE, hljs.C_BLOCK_COMMENT_MODE, NUMBERS, STRINGS];
    var EXPRESSION_CONTEXT = {
        // This mode covers expression context where we can't expect a function
        // definition and shouldn't highlight anything that looks like one:
        // `return some()`, `else if()`, `(x*sum(1, 2))`
        variants: [
            {
                begin: /=/,
                end: /;/
            },
            {
                begin: /\(/,
                end: /\)/
            },
            {
                beginKeywords: 'new throw return else',
                end: /;/
            }
        ],
        keywords: CPP_KEYWORDS,
        contains: EXPRESSION_CONTAINS.concat([
            {
                begin: /\(/,
                end: /\)/,
                keywords: CPP_KEYWORDS,
                contains: EXPRESSION_CONTAINS.concat(['self']),
                relevance: 0
            }
        ]),
        relevance: 0
    };
    var FUNCTION_DECLARATION = {
        className: 'function',
        begin: '(' + FUNCTION_TYPE_RE + '[\\*&\\s]+)+' + FUNCTION_TITLE,
        returnBegin: true,
        end: /[{;=]/,
        excludeEnd: true,
        keywords: CPP_KEYWORDS,
        illegal: /[^\w\s\*&:<>]/,
        contains: [
            {
                // to prevent it from being confused as the function title
                begin: DECLTYPE_AUTO_RE,
                keywords: CPP_KEYWORDS,
                relevance: 0
            },
            {
                begin: FUNCTION_TITLE,
                returnBegin: true,
                contains: [TITLE_MODE],
                relevance: 0
            },
            {
                className: 'params',
                begin: /\(/,
                end: /\)/,
                keywords: CPP_KEYWORDS,
                relevance: 0,
                contains: [
                    hljs.C_LINE_COMMENT_MODE,
                    hljs.C_BLOCK_COMMENT_MODE,
                    STRINGS,
                    NUMBERS,
                    CPP_PRIMITIVE_TYPES,
                    // Count matching parentheses.
                    {
                        begin: /\(/,
                        end: /\)/,
                        keywords: CPP_KEYWORDS,
                        relevance: 0,
                        contains: ['self', hljs.C_LINE_COMMENT_MODE, hljs.C_BLOCK_COMMENT_MODE, STRINGS, NUMBERS, CPP_PRIMITIVE_TYPES]
                    }
                ]
            },
            CPP_PRIMITIVE_TYPES,
            hljs.C_LINE_COMMENT_MODE,
            hljs.C_BLOCK_COMMENT_MODE,
            PREPROCESSOR
        ]
    };
    return {
        aliases: ['c', 'cc', 'h', 'c++', 'h++', 'hpp', 'hh', 'hxx', 'cxx'],
        keywords: CPP_KEYWORDS,
        // the base c-like language will NEVER be auto-detected, rather the
        // derivitives: c, c++, arduino turn auto-detect back on for themselves
        disableAutodetect: true,
        illegal: '</',
        contains: [].concat(EXPRESSION_CONTEXT, FUNCTION_DECLARATION, EXPRESSION_CONTAINS, [
            PREPROCESSOR,
            {
                begin: '\\b(deque|list|queue|stack|vector|map|set|bitset|multiset|multimap|unordered_map|unordered_set|unordered_multiset|unordered_multimap|array)\\s*<',
                end: '>',
                keywords: CPP_KEYWORDS,
                contains: ['self', CPP_PRIMITIVE_TYPES]
            },
            {
                begin: hljs.IDENT_RE + '::',
                keywords: CPP_KEYWORDS
            },
            {
                className: 'class',
                beginKeywords: 'class struct',
                end: /[{;:]/,
                contains: [
                    {
                        begin: /</,
                        end: />/,
                        contains: ['self']
                    },
                    // skip generic stuff
                    hljs.TITLE_MODE
                ]
            }
        ]),
        exports: {
            preprocessor: PREPROCESSOR,
            strings: STRINGS,
            keywords: CPP_KEYWORDS
        }
    };
}
